Production and Applications of Isostatic Graphite Blocks

Production and Applications of Isostatic Graphite Blocks

Introduction

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Isostatic graphite blocks are highly engineered materials known for their exceptional properties and wide range of applications. In this article, we will delve into the production process of isostatic graphite blocks, emphasizing key steps and the significance of this material in various industries.

Production Process of Isostatic Graphite Blocks

1.1 Raw Material Selection

The manufacturing of isostatic graphite blocks begins with the careful selection of high-quality graphite powders. The chosen powders should have specific characteristics such as high purity, fine particle size, and excellent thermal conductivity.

1.2 Blending and Mixing

The selected graphite powders are blended and mixed with binders and additives to enhance the material's strength and plasticity. This mixture undergoes a thorough blending process to ensure uniform distribution of the components.

1.3 Molding

The blended graphite mixture is then subjected to a molding process, where it is compressed under high pressure to form green blocks or preforms. The molds used in this process are designed to impart the desired shape and dimensions to the graphite blocks.

1.4 Isostatic Pressing

Isostatic pressing is the key step in the production of isostatic graphite blocks. The green blocks or preforms are loaded into a high-pressure vessel filled with a pressurizing medium, usually a liquid or gas. The pressure is applied uniformly from all directions, allowing the material to be compressed evenly and eliminate any internal defects.

1.5 Carbonization and Graphitization

After isostatic pressing, the compressed blocks undergo a heat treatment process known as carbonization. During carbonization, the binders and additives are removed through controlled heating, leaving behind a porous carbon structure. Subsequently, graphitization is performed by exposing the carbonized blocks to extremely high temperatures, converting the carbon into graphite and imparting its unique properties.

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Applications of Isostatic Graphite Blocks

2.1 Semiconductor Manufacturing

Isostatic graphite blocks are widely used in the semiconductor industry for fabricating silicon wafers, crucibles, and other components. Their excellent thermal stability, electrical conductivity, and low impurity content make them ideal for high-temperature processes and precise manufacturing.

2.2 Solar Energy Applications

Isostatic graphite blocks find extensive usage in solar energy applications, particularly in the production of photovoltaic (PV) cells. These blocks serve as crucial components in PV cell manufacturing, providing excellent thermal management, electrical conductivity, and mechanical strength.

2.3 Precision Engineering

The unique combination of high strength, dimensional stability, and machinability makes isostatic graphite blocks indispensable in precision engineering. They are employed in the production of electrodes, molds, and fixtures for various industries, including aerospace, automotive, and mold making.

Conclusion

Isostatic graphite blocks are produced through a meticulous manufacturing process involving raw material selection, blending, molding, isostatic pressing, carbonization, and graphitization. Their superior properties and versatility enable their application in semiconductor manufacturing, solar energy, precision engineering, and other fields. Understanding the production and applications of isostatic graphite blocks provides valuable insights into the importance and potential of this remarkable material in modern industries.

Isostatic Graphite – Isotropic Graphite Material

Molding Technology

The principle of isostatic pressing technology is based on Pascal's law. It changes the unidirectional (or bidirectional) compression of the material into multi-directional (omnidirectional) compression. During the process, the carbon particles are always in a disordered state, and the volume density is relatively uniform with isotropic properties. Besides, it is not subject to the height of the product, thus making the isostatic graphite have no or little performance differences.

According to the temperature at which the forming and solidification take place, isostatic pressing technology can be divided into cold isostatic pressing, warm isostatic pressing, and hot isostatic pressing. Isostatic pressing products have a high density, typically 5% to 15% higher than those of unidirectional or bidirectional mold pressing products. The relative density of isostatic pressing products can reach 99.8% to 99.09%.

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